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The fonts and colours for the GTK themes will be read in from your Qt settings so any KDE font/colour changes will also affect your GTK apps.

If you want Gtk2 apps to use the theme system wide, create a symboliclink to the new theme like this: ln -s /usr/share/themes/QtCurve/gtk-2.0/gtkrc /etc/gtk-2.0/gtkrc

If you are using a dark theme, and fonts in Firefox are unreadable becauseit does not invert the colors, you can pass USERCHROME=no to the script,which will disable the modification of userchrome.css in Firefox.